May, 1922] DARLINGTON — DR. BEAL's SEED EXPERIMENT 
269 
only once, would seem to indicate that conditions for germination were 
especially favorable. On the other hand, the question arises why Bursa 
hursa-pastoris and Chaetochloa lutescens, each of which have failed only 
once, failed to germinate. Table 2 gives the complete results of the ex- 
periment up to the spring of 1920. 
Beal Botanical Laboratory, 
East Lansing, Michigan. 
